Sweet Potato Au Gratin is the ultimate comfort food casserole recipe.
Thinly sliced sweet potatoes, smothered in a cream sauce, topped with cheese. Hearty and delicious.
This au gratin potato recipe was originally posted in the 41st edition of the Milk Calendar and I shared it in December 2017 as a sponsored post.
I was thrilled when I was asked to recreate the January 2018 recipe Hearty Sweet Potato Au Gratin because I am a potato lover.
I was so excited when I was asked to take part in the #MilkCalendar campaign that year. My fridge is ALWAYS stocked with several varieties of cheese. I use it in delicious recipes for any meal of the day. When I want a snack, crackers and cheese are my “go-to” options most days of the week.
RECIPE and INSTRUCTIONS for this sweet potato gratin recipe can be found at the bottom of this post.
These scalloped sweet potatoes are simple and oh so delicious. Cheese is the most important factor in au gratin potatoes.
You Will Need:
- sweet potatoes
- sharp cheddar cheese
- fresh thyme
You will want to select sharp, bold cheeses. Old cheddar, gruyere, Swiss or feta would be awesome choices.
Most people will say there is NO difference. Both use thinly sliced potatoes cooked in a casserole dish. Scalloped potatoes ALWAYS have a cream sauce. Au gratin is ALWAYS is cooked with cheese. This recipe contains both. Scalloped potatoes usually have a breadcrumb topping. Gratin Dauphinois does not.
Preparing This Sweet Potato Au Gratin Bake
These cheesy au gratin potatoes are not difficult. You have a couple of parts to this recipe. The cream sauce, and the layering of the casserole. See the recipe card for the exact instructions, but here is the quick low down.
- Peel and slice your sweet potatoes (about 1/8 inch).
- Grate your cheese.
- Preheat the oven, and prepare a casserole dish.
- Make the cream sauce in a medium saucepan.
- This will take about 4-5 minutes.
- Layer the casserole.
- Start with the potatoes.
- Add some cream sauce, and thyme.
- Repeat the layers.
- Cover and bake.
- Remove from oven and take off the foil.
- Add the grated cheese and bake uncovered until bubbly.
This Sweet Potato Au Gratin has already become a favourite here. We like to make it different each time by switching up the cheese.
Perfect for any night of the week. Awesome on the holiday dinner table too. It is the perfect side to Crispy Baked Chicken Drumsticks.
Craving more delicious potato recipes?
Looking for another sliced potato recipe? Crispy Cast Iron Potatoes make the perfect side to any meal of the day.
How about a delicious one-pan dinner? Easy Corned Beef and Potato Skillet is perfect. In fact, we love this on St. Patrick’s Day. A little twist on corned beef and cabbage.
Need the perfect party appetizer? Smoked Salmon Potato Appetizers are elegant and easy to prepare. They fly off the party tray.
I don’t know of anyone who does not love fries. Crispy Spicy Fries are a healthy alternative since they are made in the air fryer.
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Milk Calendar Hearty Sweet Potato Au Gratin
- 1 1/2 pounds sweet potatoes
- 2 tbsp butter
- 1 clove garlic (minced)
- 1/2 tsp salt
- 2 tbsp all-purpose flour
- 2 cups 18% cream
- 2 tbsp fresh thyme (chopped)
- 1/2 cup Canadian cheddar (shredded)
- Preheat oven to 375º F, and grease a 8×8 inch baking pan. Set aside.
- Peel potatoes and carefully slice into 1/8 inch thick rounds. Set aside.
- Grate/shred cheese. Set aside.
To make the Cream Sauce:
- In a medium saucepan melt butter over medium heat.
- Add garlic and salt. Stir 1 minute.
- Whisk in flour until combined.
- Gradually add cream, whisking until combined and smooth.
- Bring to a boil, and heat until thickened (2-3 minutes), whisking occasionally. Remove from heat when done.
To layer the Sweet Potato Au Gratin:
- Layer 1/2 the potatoes into the prepared baking dish.
- Scatter 1/2 the chopped thyme on top.
- Top with 1/2 the cream sauce.
- Repeat with the potatoes, sauce and thyme.
- Press down slightly to even out layers and get all potatoes covered in cream.
- Cover with foil, and bake for 30 minutes.
- Take dish out of the oven, and remove foil.
- Sprinkle grated cheese (and additional thyme if you like), and bake uncovered for 15 minutes until top is bubbly and deep golden brown.
- Remove from oven and let stand for 10 minutes.